Here’s the lay of the land. Service is fast-casual and straight to the point: order at the window, doctor your plate at the self-serve salsa and lime bar, and grab a high-top under the shade or tailgate at your car. The crew is efficient—even when the line spills into the parking lot—so the turnover stays quick. Hours typically run morning through early evening (think around 7:00 a.m.–7:30 p.m., daily), but if you’re planning a trek, it’s smart to peek at their site or socials for day-of updates. The truck cluster sits between auto shops, which is part of the charm—very neighborhood, very SoCal.

Now, the food. Mariscos are the north star here, and the menu is deeper than you might expect from a truck. If you like bright, citrusy heat, start with Aguachile—or go playful with the Mango y Tamarindo spin for a sweet-tart kick. When you want something steamy and restorative, the classic Caldo 7 Mares (seven-sea soup) lands with rich broth and tender seafood. For something shareable, the Botanas (snack platters) bring shrimp, octopus, scallops, or mixed seafood—perfect with a round of tostadas and cold sodas.

On the taco side, you’ll find both griddled and battered seafood plus some loaded signatures. A few can’t-miss options:

Pescado (Fish) Taco — battered, crisp, and showered with cabbage and pico.
Camaron a la Plancha (Grilled Shrimp) Taco — juicy, lightly smoky, and endlessly snackable.
Gobernador Taco — shrimp + melted cheese + peppers and onions = oozy perfection.
Costa Azul Taco — shrimp, marlin, and bacon for a salty-savory bite.
Mariscada (Mix) Taco — an all-star combo of shrimp, octopus, crab, and more.

Round that out with shrimp quesadillas, marlin quesadillas, or a burrito (try Mar y Tierra for a surf-and-turf fix). If you’re in a tostada mood, the lineup runs from Aguachile Tostada and Blue Tuna to richer picks like Culichi and Negrita. Portions are generous, prices are fair for the quality, and plating is built for speed—perfect for families, groups, or anyone squeezing in a quick lunch.

Because the name says “Birria” as well as mariscos, yes, you’ll also come across birria plates and tacos on ordering apps and rotating boards. The birria’s slow-cooked richness plays nicely with the house salsas; if you see quesa-style options (meat + cheese), they’re a worthy add-on when you want something extra melty. And if you’re keeping it casual at home, El Prieto partners with major delivery apps in San Diego County, so you can get those tacos, caldos, and botanas brought to your door.

For first-timers, here’s a quick game plan that hits the greatest hits without overthinking it:

Aguachile (classic or mango-tamarindo) to wake up your palate.
A taco trio — Pescado, Gobernador, Camaron a la Plancha — so you taste battered, cheesy, and grilled styles side-by-side.
One Caldo 7 Mares to share, because that broth is comfort in a cup.
A tostada (try Blue Tuna or Aguachile Tostada) if you’re chasing crunch.

The vibe? Call it bustling, open-air, and friendly. You’ll see regulars who know their order by heart, first-timers filming their plates for Reels, and families stretching a botana into a full table spread. Staff keep things moving but still find time for a quick recommendation (“Gobernador or Costa Azul?” “Both.”). There’s ample street parking around the corner, and on busy afternoons someone may help direct cars so nobody gets boxed in.

For essentials, save these details: Address: 3031 Main St #3029, Chula Vista, CA 91911. Phone: (619) 495-5247 (handy for quick questions). If you’re elsewhere in the county, El Prieto also pops up across multiple locations—so if a friend raves about a truck in University Ave or you spot a listing in National City or El Cajon, you’re still in the right family. Just know that menus and availability can vary a bit by spot; the Main St yard is the go-to when you want the full mariscos spread with that two-truck energy.

Popular Dishes (crowd favorites to look for):

Aguachile (classic or Mango y Tamarindo)
Gobernador Taco (shrimp + cheese)
Pescado Taco (battered fish)
Camaron a la Plancha Taco (grilled shrimp)
Caldo 7 Mares (seafood soup)
Blue Tuna / Aguachile Tostadas (crisp, tangy, and photogenic)

If you’re building a shareable feast, my pro move is a botana for the table, a taco flight, and one caldo—then fill any gaps with a quesadilla de camaron or Mar y Tierra burrito. It’s balanced, it travels well, and it turns a quick stop into a full-on mariscos moment.